Refactor Mkvcbuild.pm to facilitate modules migrations
Refactor Mkvcbuild.pm to facilitate modules migrations

This is in preparation to "upgrade" some modules from contrib/ to
src/bin/, per discussion.

Author: Michael Paquier

greenplum-db/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,adam8157/gpdb,adam8157/gpdb,ashwinstar/gpdb,ashwinstar/gpdb,pavanvd/postgres-xl,xinzweb/gpdb,yazun/postgres-xl,greenplum-db/gpdb,lisakowen/gpdb,lisakowen/gpdb,ashwinstar/gpdb,50wu/gpdb,50wu/gpdb,jmcatamney/gpdb,Postgres-XL/Postgres-XL,jmcatamney/gpdb,yazun/postgres-xl,lisakowen/gpdb,50wu/gpdb,50wu/gpdb,jmcatamney/gpdb,yazun/postgres-xl,techdragon/Postgres-XL,oberstet/postgres-xl,greenplum-db/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,zeroae/postgres-xl,techdragon/Postgres-XL,lisakowen/gpdb,greenplum-db/gpdb,ovr/postgres-xl,oberstet/postgres-xl,zeroae/postgres-xl,xinzweb/gpdb,Postgres-XL/Postgres-XL,ashwinstar/gpdb,pavanvd/postgres-xl,adam8157/gpdb,xinzweb/gpdb,xinzweb/gpdb,pavanvd/postgres-xl,techdragon/Postgres-XL,ovr/postgres-xl,50wu/gpdb,xinzweb/gpdb,ashwinstar/gpdb,Postgres-XL/Postgres-XL,lisakowen/gpdb,50wu/gpdb,pavanvd/postgres-xl,adam8157/gpdb,pavanvd/postgres-xl,greenplum-db/gpdb,techdragon/Postgres-XL,techdragon/Postgres-XL,lisakowen/gpdb,ashwinstar/gpdb,lisakowen/gpdb,greenplum-db/gpdb,50wu/gpdb,50wu/gpdb,yazun/postgres-xl,jmcatamney/gpdb,xinzweb/gpdb,ashwinstar/gpdb,zeroae/postgres-xl,jmcatamney/gpdb,Postgres-XL/Postgres-XL,adam8157/gpdb,ovr/postgres-xl,zeroae/postgres-xl,adam8157/gpdb,oberstet/postgres-xl,jmcatamney/gpdb,oberstet/postgres-xl,yazun/postgres-xl,adam8157/gpdb,ovr/postgres-xl,xinzweb/gpdb,Postgres-XL/Postgres-XL,ovr/postgres-xl,oberstet/postgres-xl,adam8157/gpdb,xinzweb/gpdb,zeroae/postgres-xl,lisakowen/gpdb,jmcatamney/gpdb